<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <style>  </style> </head> <body bgcolor=white lang=EN-US link=blue vlink=purple> <div class=Section1> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'>Is that a Stanwood 4.9 ratio?   If so, I think that’s a bit low and you might compromise the regulation some.  Remember that as you move the capstan forward on the key you also benefit from the move away from the flange in the 2<sup>nd</sup> class wippen lever.  I don’t like to get a ratio lower than 5.5 (Stanwood) which should allow you a fair amount of leeway with hammers and front weights to achieve something between 36 and 40 BW.  My usual target is 37.  If you calculate the ratio via linear measurements, the number will be bit lower than with Stanwood measurements.  </span></font></p> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'> </span></font></p> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'>Otherwise, capstan movements are pretty common on action I work on.  Relocating or changing the height of wippen heels is not uncommon either.</span></font></p> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'> </span></font></p> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'>David Love</span></font></p> <p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size: 10.0pt;font-family:Arial;color:navy'> </span></font></p> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'><br> Farrell wrote:<br> <br> </span></font></p> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> <meta http-equiv=Context-Type content="text/html; charset=iso-8859-1"> Phil Bondi and I dove into an 1890s WNG action from a 6' 4" Knabe today to try and straighten out some basic action geometry. We haven't got all the kinks worked out yet, but we seem to be getting there. With only a large capstan move and removal of a couple leads, we went from an action ratio of over 6.0 down to 4.9. DWs went from 60+ to 50 and less (I know, too light) and BW in the 36 to 40g range. We have a lot of work to do yet, but it seems the capstan move described below has gotten us into the right ball park anyway. </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>Most notable was a very large capstan move that we will likely keep (unless someone so kindly informs us of a potential problem the change might induce). The photo below shows the original capstan in the background. The forward key had its capstan moved 10mm forward and 11mm lower. The middle key had its capstan moved 13mm forward and 12mm lower. The second photo shows the modified wippen heel. These lower positions put the capstan right on the magic line at half blow. The capstan/wippen heel interface went from a traveling, grinding, sliding affair and a note with 17g friction to a perfectly interfacing union with no apparent sliding and a note with 9g friction. We were amazed at the improvement in friction and interface movement. </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>This strikes me as a rather drastic capstan move. Has anyone else run across an action that needed such a large capstan move? As our action ratio is down to 4.9 and key ratio is down around 4.8 with the 10mm forward capstan migration, we may move it back just a few millimeters. But still it seems large. Is there some hidden pitfall I'm not seeing? Comments? </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>Terry Farrell </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'><img width=568 height=426 src="cid:image001.jpg@01C6AA64.A991E440"></span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> <div> <p class=MsoNormal style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'><img width=568 height=426 src="cid:image002.jpg@01C6AA64.A991E440"></span></font></p> </div> </div> </body> </html>